On Tuesday, May 12, 2015 at 3:13:32 PM UTC-4, zljubi...@gmail.com wrote: > Hi, I have python file with the following structure: > > import... > > A = configparser.get(...) > B = configparser.get(...) > > Command line parameters parsing [they can change variable A or B] > > Def usage() > Print how to use script parameters > > def main(): > ... > > if __name__ == "__main__": > main() > > If I find an error in command line parameters section I cannot call function > usage() because it is not defined yet. > > I have few options here: > 1. Put definition of usage function before command line parameters parsing > section > 2. Make parameters global and put them in the main function > 3. ...maybe some other options... >
I would put all of the code into a function some place. Don't have anything at the top level of the file except imports, function (and class) definitions, and an "if __name__....." clause at the bottom. If you need to use globals, assign them inside a parse_arguments function that has a "global" statement in it. This advice is consistent with Chris' "define things before they are used." It does it by defining everything before anything is run. As a side note, if you are going to have code at the top-level of the file, then there's no point in the "if __name__..." clause. That clause is designed to make a file both runnable and importable. But your top-level code makes the file very difficult to import. --Ned. -- https://mail.python.org/mailman/listinfo/python-list
